@charset "UTF-8";

// Perspective
//-------------------------------------------------------------

// 规定 3D 元素的透视效果
@mixin perspective($depth: none) {
  // none | <length>
  @include prefixes(perspective, $depth);
}

// 规定 3D 元素的底部位置
@mixin perspective-origin($value: 50% 50%) {
  // x-axis - left | center | right  | length | %
  // y-axis - top  | center | bottom | length | %
  @include prefixes(perspective-origin, $value);
}
// 定义元素在不面对屏幕时是否可见
@mixin backface-visibility($visibility:hidden){
  // visible | hidden
  @include prefixes(backface-visibility, $visibility, webkit spec);
}
